I've already tried a search and read through a lot of the posts here and haven't found what I'm looking for so I thought I'd just ask. I've got an '03 YZ450F that I couldn't get to run right to save my life. I tried everything I could think of including every jetting combo imaginable but it still acted like it was sucking air. After looking closer at my carb, it seemed to be pretty much worn out so we figured that could have been the problem. My mechanic/sponsor was helping me with this, and he suggested putting the carb from his CRF on there so we did and it ran perfectly. So that pretty much made up my mind that I needed a carb...but the '03 YZ carb is reduculously high (as I guess y'all know) and I can't afford one. So my question is, what all year carbs will work on the '03 YZ450F? I know the '03 and '04 carbs have the same part number and that's all any of the dealers around here said they could do was compare part numbers.